package com.mg.utils;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 * @author mg1213
 * 2018/3/28
 **/
public class HttpUtil {
    private HttpUtil() {

    }

    /**
     * 发送HttpPost请求
     *
     * @param strURL 服务地址
     * @param object
     * @return 成功:返回json字符串<br/>
     */
    public static Map<String,Object> jsonPost(String strURL, Object object) throws IOException {
        Map<String, Object> result = new HashMap<>();
        URL url = new URL(strURL);// 创建连接
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.setUseCaches(false);
        connection.setInstanceFollowRedirects(true);
        connection.setRequestMethod("POST"); // 设置请求方式
        connection.setRequestProperty("Accept", "application/json"); // 设置接收数据的格式
        connection.setRequestProperty("Content-Type", "application/json"); // 设置发送数据的格式
        connection.connect();
        OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream(), "UTF-8"); // utf-8编码

        out.append(JsonUtils.toJson(object));
        out.flush();
        out.close();

        int code = connection.getResponseCode();
        result.put("code", code);
        InputStream is = null;
        if (code == 200) {
            is = connection.getInputStream();
        } else {
            is = connection.getErrorStream();
        }

        // 读取响应
        int length = (int) connection.getContentLength();// 获取长度
        if (length != -1) {
            byte[] data = new byte[length];
            byte[] temp = new byte[512];
            int readLen = 0;
            int destPos = 0;
            while ((readLen = is.read(temp)) > 0) {
                System.arraycopy(temp, 0, data, destPos, readLen);
                destPos += readLen;
            }
            String result1 = new String(data, "UTF-8"); // utf-8编码
            Map<String, Object> map = JsonUtils.toMap(result1);
            result.putAll(map);
            ;
            return result;
        }

        return result; // 自定义错误信息
    }
}
